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On the Distribution of Lightning Current among Interconnected Grounding Systems in Medium Voltage Grids

Author

Listed:
  • Guido Ala

    (Department of Energy, Information Engineering and Mathematical Models (DEIM)—University of Palermo, viale delle Scienze-Edificio 9, 90128 Palermo, Italy)

  • Salvatore Favuzza

    (Department of Energy, Information Engineering and Mathematical Models (DEIM)—University of Palermo, viale delle Scienze-Edificio 9, 90128 Palermo, Italy)

  • Elisa Francomano

    (Department of Industrial and Digital Innovation (DIID)—University of Palermo, viale delle Scienze-Edificio 8, 90128 Palermo, Italy)

  • Graziella Giglia

    (Department of Energy, Information Engineering and Mathematical Models (DEIM)—University of Palermo, viale delle Scienze-Edificio 9, 90128 Palermo, Italy)

  • Gaetano Zizzo

    (Department of Energy, Information Engineering and Mathematical Models (DEIM)—University of Palermo, viale delle Scienze-Edificio 9, 90128 Palermo, Italy)

Abstract

This paper presents the results of a first investigation on the effects of lightning stroke on medium voltage installations’ grounding systems, interconnected with the metal shields of the Medium Voltage (MV) distribution grid cables or with bare buried copper ropes. The study enables us to evaluate the distribution of the lightning current among interconnected ground electrodes in order to estimate if the interconnection, usually created to reduce ground potential rise during a single-line-to-ground fault, can give place to dangerous situations far from the installation hit by the lightning stroke. Four different case studies of direct lightning stroke are presented and discussed: (1) two secondary substations interconnected by the cables’ shields; (2) two secondary substations interconnected by a bare buried conductor; (3) a high voltage/medium voltage station connected with a secondary substation by the medium voltage cables’ shields; (4) a high voltage/medium voltage station connected with a secondary substation by a bare buried conductor. The results of the simulations show that a higher peak-lowering action on the lighting-stroke current occurs due to the use of bare conductors as interconnection elements in comparison to the cables’ shields.

Suggested Citation

  • Guido Ala & Salvatore Favuzza & Elisa Francomano & Graziella Giglia & Gaetano Zizzo, 2018. "On the Distribution of Lightning Current among Interconnected Grounding Systems in Medium Voltage Grids," Energies, MDPI, vol. 11(4), pages 1-16, March.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:4:p:771-:d:138531
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    References listed on IDEAS

    as
    1. Nur Hazirah Zaini & Mohd Zainal Abidin Ab. Kadir & Mohd Amran Mohd Radzi & Mahdi Izadi & Norhafiz Azis & Nor Izzati Ahmad & Mohd Solehin Mohd Nasir, 2017. "Lightning Surge Analysis on a Large Scale Grid-Connected Solar Photovoltaic System," Energies, MDPI, vol. 10(12), pages 1-18, December.
    2. Ala, Guido & Fasshauer, Gregory E. & Francomano, Elisa & Ganci, Salvatore & McCourt, Michael J., 2017. "An augmented MFS approach for brain activity reconstruction," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 141(C), pages 3-15.
    3. Ala, Guido & Francomano, Elisa & Ganci, Salvatore, 2015. "Unconditionally stable meshless integration of time-domain Maxwell’s curl equations," Applied Mathematics and Computation, Elsevier, vol. 255(C), pages 157-164.
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    Cited by:

    1. Zhuoran Liu & Weidong Shi & Bo Zhang, 2021. "Numerical Analysis of Transient Performance of Grounding Grid with Lightning Rod Installed on Multi-Grounded Frame," Energies, MDPI, vol. 14(12), pages 1-13, June.
    2. Donghui Luo & Yongxing Cao & Yu Zhang & Shijun Xie & Chenmeng Zhang & Shuping Cao, 2021. "Study on Structural Parameters and Analysis Method of Soil Successive Impulse Discharge Channel," Energies, MDPI, vol. 14(4), pages 1-17, February.
    3. Giovanni Aiello & Salvatore Alfonzetti & Santi Agatino Rizzo & Nunzio Salerno, 2019. "Thin Conductor Modelling Combined with a Hybrid Numerical Method to Evaluate the Transferred Potential from Isolated Grounding System," Energies, MDPI, vol. 12(7), pages 1-11, March.

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